Skiving machine



July 28, 1942. E, Y 2,290,994

SKIVING MACHINE F iled Feb. 21, 1941 Patented July 28, 1942 UNITEDSTATESPATENT OFFICE v 2,290,994 SKIVING MACHINE Eugene J. Ray, Beverly,Mass, assignor to United Shoe Machinery Corporation, Flemington, N. J acorporation of New Jersey I Application February 21, 1941, Serial No.380,027

3 Claims.

This invention relates to skiving machines and is herein illustrated asembodied in a machine for skiving the margin of sheet material such, forexample, as parts of boots and shoes.

A machine in common use comprises a tubu-' lar knife, a feed-rolllocated partly within the knife, a presser for holding the work againstthe roll, and a throat-plate the forward end of which overhangs aportion of the roll. The feed-roll is convex lengthwise to correspond tothe curvature of the knife and the surface of the throatplate is alsoconvex, the work being fed over the throat-plate and the roll to theknife, an edge-guide being provided which is adjustable crosswise of themachine on the throat-plate, said guide being comparatively wide andadapted to contact with a considerable length of the edge of the Work.Such a machine is adapted particularly to the skiving of the margins ofcomparatively thick pieces of sheet material, the edges of which arestraight or only slightly curved.

In order to adapt such a machine for skiving the margins of pieces ofwork the edges of which are more abruptly curved, there is provided,according to the present invention, a comparatively narrow edge-guidehaving projecting from its work-engaging end a thin shelf over which themargin of the work is fed, and means for mounting the guide in suchmanner that it may be adjusted crosswise of the machine and at the sametime its end remote from the work-engaging end may be adjustedvertically so as to maintain the edge of the shelf in contact with theconvex surface of the throat-plate in any crosswise position into whichthe guide may be adjusted. By maintaining the thin edge of the shelf incontact with the throat-plate, all liability of the margin of the workgetting beneath the guide is obviated; and because the guiding face iscomparatively narrow. considered in the direction of feed movement ofthe work, the edges of pieces of work which are considerably curved mayreadily be skived.

This and other features of the invention, including certain details ofconstruction and combinations of parts, will be set forth as embodied inan illustrated machine.

Referring to the accompanying drawing,

Fig. 1 is a side elevation of a portionof a machine in which the presentinvention is embodied; and

Fig. 2 is a view looking down upon a portion of the machine, all of thepresser and its carrier having been omitted except the stem of thecarrier which is shown in cross-section, a piece of work being shown inprocess of having its margin skived.

The machine comprises a rotary tubular knife 3, a rotary feed-roll 5which is convex lengthwise and is located partly within the knife, anangularly adjustable presser 1, a presser carrier in the form of a block9 on the lower end of a stem II, and a throat-plate 13 the surface ofwhich is convex crosswise of the machine to correspond substantially tothe convexity of the feed roll and the knife. The work is fed (away fromthe observer as viewed in Fig. 1 or to the right as viewed in Fig. 2)over the throat-plate and roll to the knife. As thus far described, themachine is like that shown in United States Letters Patent No.1,688,434, granted October 23, 1928, upon an application filed in myname, except that in the patented machine an angularly adjustable drivenpresser-roll is shown in place of the presser of the illustratedmachine. However, the particular construction of the presser and itsmounting form no part of the present invention.

In order to adapt a machine of this general type to skiving the marginsof pieces of work such as a quarter I00 whose edges are more or lessabruptly curved, there is provided an edge guide comprising a thin barthe greater part of which extends crosswise of the machine. Thework-engaging end of this bar is curved until it extends approximatelyin the direction of feed movement of the work; and projecting from thelower portion of this work-engaging end is a thin beveled shelf l1, theedge of which rests on the convex surface of the throat-plate l3, theworkengaging end of the guide, including a part of the shelf,overhanging the feed-roll. The end of the edge-guide remote from itswork-engaging end has a substantially horizontal slot in; and throughthis slot, as well as through a vertical slot 2| in a stationary uprightbracket 23, passes a clamping means in the form of a bolt 25. A washer21 and a nut 29 provide means for fastening the guide I5 in adjustedposition.

The work I00 is guided by engagement of its edge with the upright face3| of the guide I5, its margin passing over the beveled shelf H as shownin Fig. 2. The guide must of course be adjusted crosswise of themachine, and if this adjustment were in a straight horizontal path theedge at the curved extremity of the shelf I! would be held in contactwith the convex surface of the throat-plate only when this edge was atthe top of said convex surface. With the construction shown, however, inwhich the end of the guide remote from its work-engaging end may beadjusted vertically, it is possible to keep the thin edge of the shelf Hin contact with the convex surface of the throat-plate in any positioninto which the guide may be adjusted. The work may thus be presentedover the beveled shelf without any danger of getting beneath it andremains in contact with the comparatively narrow work-engaging face ofthe curved bar during the skiving operation.

Having thus described the invention, what I claim as new and desire tosecure by Letters Patent of the United States is:

1. A skiving machine having in combination a rotary tubular knife, arotary feed roll located partly within the knife, a throat-plate theforward end of which overhangs a portion of the roll, said throat-platehaving a surface which is convex crosswise of the machine, a presser forholding the work against the roll, an edge guide having projecting fromits work-engaging end a thin shelf which rests upon the throat-plate andover which the margin of the work passes, and means whereby the guidemay be adjusted crosswise of the machine and its end remote from itswork-engaging end adjusted vertically.

2. A skiving machine having in combination a rotary tubular knife, arotary feed roll located partly within the knife, a throat-plate theforward end of which overhangs a portion of the roll, the surface ofsaid throat-plate being convex, a presser for holding the work againstthe roll, an edge guide having at its work-engaging end an upright wallagainst which the edge of the work is held and a shelf over which themargin of the work passes during the skiving of the work, said guidehaving at the end remote from its work-engaging end a slot, a stationarymember having a slot at an angle to that in the guide, and meansextending through the two slots to clamp the guide adjustably to thestationary member, whereby when the clamping means has been loosened andthe guide is adjusted crosswise of the machine, the end of the guideremote from the work-engaging end may be raised or lowered as may berequired to maintain the edge of the shelf in contact with the convexsurface of the throat-plate.

3. A skiving machine having in combination a rotary tubular knife, arotary feed-roll having a surface which is convex lengthwise of theroll, said roll being located partly within the knife, a throat-platehaving a convex surface which corresponds approximately to that of theroll, the forward end of said plate overhanging a portion of the roll, apresser for holding the work against the roll, a work-engaging portionof the roll being exposed between the presser and the throat-plate, anedge guide the greater part of which is substantially parallel to theaxis of the roll, the work-engaging end of said guide extending in thedirection of feed movement of the work and having extending from itslower portion a beveled shelf over which the margin of the work is fed,the forward end of said shelf overhanging the roll, and means wherebythe guide may be adjusted crosswise of the direction of feed movement ofthe work and its end remote from the work-engaging end adjustedvertically so as to maintain the edge of the beveled shelf at all timesin contact with the convex surface of the throatplatei EUGENE J. RAY.

